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9/11: 10 Years Later Photos

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Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, family members of those who died in the attack on the Pentagon take family photos as they visit the Pentagon Memorial September 11, 2011 in Arlington, Virginia. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Photo Credit: Win McNamee/Getty Images

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Former Secretary of Defense Donald Rumsfeld arrives for a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Vice President Joseph R. Biden arrives for a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Secretary of Defense Leon E. Panetta, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during the national anthem at a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonUS Chairman of the Joint Chiefs of StaffUS Chairman of the Joint Chiefs of Staff Adm. Mike Mullen(L), Secretary of Defense Leon Panetta and US Vice President Joe Biden watch a video screen during the Pentagon 911 observance ceremonies on the 10 year anniversary of the 9/11 terrorist attacks September 11, 2011, at the Pentagon. AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Service members carry flowers to each marker in the Pentagon Memorial during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Vice President Joseph R. Biden speaks at a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Secretary of Defense Leon E. Panetta, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, a wreat lies upon a memorial bench as family members of those who died in the attack on the Pentagon visit the Pentagon Memorial September 11, 2011 in Arlington, Virginia. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, family members of those who died in the attack on the Pentagon, visit the Pentagon Memorial September 11, 2011 in Arlington, Virginia. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, family members of those who died in the attack on the Pentagon, visit the Pentagon Memorial September 11, 2011 in Arlington, Virginia. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, family members of those who died in the attack on the Pentagon take family photos as they visit the Pentagon Memorial September 11, 2011 in Arlington, Virginia. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, Chin Sok Wells kisses his ten week old son Cristian on the memorial bench of his deceased sister Spc. Chin Sun Pak Wells who died in the attack on the Pentagon, at the Pentagon memorial September 11, 2011 in Arlington, Virginia. Also pictured is Cathy Wells, wife of Chin Sok Wells. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Following a remembrance ceremony, family members of those who died in the attack on the Pentagon, visit the Pentagon Memorial September 11, 2011 in Arlington, Virginia. The nation is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: A military chorus sings during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Secretary of Defense Leon E. Panetta, Vice President Joseph R. Biden, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Secretary of Defense Leon E. Panetta (L) and Vice President Joseph R. Biden listen during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen speaks at a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Secretary of Defense Leon E. Panetta, Vice President Joseph R. Biden and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Secretary of Defense Leon E. Panetta speaks at a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Chairman of the Joint Chiefs of Staff Navy Admiral Mike Mullen and others will attend the service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People listen to Taps as it is played during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People stand after Taps was played during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: (L-R) Chairman of the Joint Chiefs of Staff Michael Mullen, Secretary of Defense Leon Panetta, and Vice President Joe Biden take part in a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia near Washington, DC. The United States is commemorating the 10th anniversary of the terrorist attacks of September 11, 2001 which resulted in the deaths of nearly 3,000 people when two hijacked planes crashed into the World Trade Center. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: (L-R) Chairman of the Joint Chiefs of Staff Michael Mullen, Secretary of Defense Leon Panetta, and Vice President Joe Biden observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia near Washington, DC. The United States is commemorating the 10th anniversary of the terrorist attacks of September 11, 2001 which resulted in the deaths of nearly 3,000 people when two hijacked planes crashed into the World Trade Center. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonA Pentagon Police Officer secures the peA Pentagon Police Officer secures the perimeter where US leaders including US President Barack Obama will speak on September 11, 2011 on the 10 year anniversary of the 9/11 terrorist attacks in Washington, DC. AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People arrive for a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People arrive for a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Members of the Secret Service counter sniper team and other security take positions on the roof before a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Members of the Secret Service counter sniper team and other security take positions on the roof before a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonA US Secret Service Agent secures the arA US Secret Service Agent secures the area where US leaders including US Preident Barack Obama will speak on September 11, 2011 at the Pentagon in Washington, DC, as part of the 9/11 attacks 10th anniversary. (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonThe large flag that flew over the PentagThe large flag that flew over the Pentagon after the 911 attacks is unfurled and draped over the Pentagon wall at sunrise on the 10-year Anniversary September 11, 2011 at the Pentagon in Washington, DC.. AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonWashington DC Observes 10th Anniversary Of September 11 AttacksWASHINGTON, DC - SEPTEMBER 11: The sun rises behind flags at half-mast, and the U.S. Capital, on September 11, 2011 in Washington, DC. The nation is commemorating the 10th anniversary of the terrorist attacks on lower Manhattan which resulted in the deaths of nearly 3,000 people when two hijacked planes crashed into the World Trade Center. Security has been heightened in both New York City and Washington D.C. following a terrorist threat relating to a car bomb. (Photo by Mark Wilson/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Family members mourn as they observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia. Washington, DC is commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Family members mourn as they observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia. The United States commemorates the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: People bow their heads in prayer during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Service members carry flowers to each marker in the Pentagon memorial during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Service members carry flowers to each marker in the Pentagon memorial during a memorial service at the Pentagon September 11, 2011 in Arlington, Virginia. Vice President Joseph R. Biden, Secretary of Defense Leon E. Panetta, Chairman of the Joint Chief of Staff Navy Admiral Mike Mullen and others will attend a memorial service at the Pentagon Memorial to commemorate the 10th anniversary the September 11, 2001 terrorist attacks on the United States. (Photo by Brendan Smialowski/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonWashington DC Observes 10th Anniversary Of September 11 AttacksWASHINGTON, DC - SEPTEMBER 11: A commercial airliner flies near flags set at half staff, on the grounds of the Washington monument, on September 11, 2011 in Washington, DC. Amid heightened security, the Washington, DC area and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Mark Wilson/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonWashington DC Observes 10th Anniversary Of September 11 AttacksWASHINGTON, DC - SEPTEMBER 11: A U.S.Park police officer (R) stands watch at the Lincoln Memorial on September 11, 2011 in Washington, DC. Amid heightened security, the Washington, DC and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Mark Wilson/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonWashington DC Observes 10th Anniversary Of September 11 AttacksWASHINGTON, DC - SEPTEMBER 11: A U.S.Park police officer (R) stands watch at the Lincoln Memorial on September 11, 2011 in Washington, DC. Amid heightened security, the Washington, DC area and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. (Photo by Mark Wilson/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonWASHINGTON, DC - SEPTEMBER 11: Family members mourn as they observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia. New York City and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonUS Secretary of Defense Leon Panetta(L)US Secretary of Defense Leon Panetta(L) and US Vice President Joe Biden cover their hearts for the National Anthem during the Pentagon 911 observance ceremonies on the 10 year anniversary of the 911 terrorist attacks September 11, 2011, at the Pentagon in Washington, DC. AFP Photo/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Family members mourn as they observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia. Washington, DC and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonAnniversary Of Sept. 11th Attacks Marked At PentagonARLINGTON, VA - SEPTEMBER 11: Family members mourn as they observe a moment of silence during the time of impact at a remembrance ceremony at the Pentagon September 11, 2011 in Arlington, Virginia. The United States commemorates the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat about a car bomb. (Photo by Win McNamee/Getty Images)

Anniversary of Sept. 11th Attacks Marked At PentagonWashington DC Observes 10th Anniversary Of September 11 AttacksWASHINGTON, DC - SEPTEMBER 11: A commercial airliner flies near flags set at half staff, on the grounds of the Washington monument, on September 11, 2011 in Washington, DC. Amid heightened security, the Washington, DC area and the nation are commemorating the tenth anniversary of the terrorist attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Security has been heightened in both New York City and Washington D.C. following a terrorist threat relating to a car bomb. (Photo by Mark Wilson/Getty Images)(Photo by Mark Wilson/Getty Images)